string_helpers: add kstrdup_quotable_file

#include <linux/types.h>

struct file;

/* Descriptions of the types of units to

 * print in */

enum string_size_units {

char *kstrdup_quotable(const char *src, gfp_t gfp);

char *kstrdup_quotable_cmdline(struct task_struct *task, gfp_t gfp);

char *kstrdup_quotable_file(struct file *file, gfp_t gfp);

#endif

#include <linux/export.h>

#include <linux/ctype.h>

#include <linux/errno.h>

#include <linux/fs.h>

#include <linux/limits.h>

#include <linux/mm.h>

#include <linux/slab.h>

#include <linux/string.h>

	return quoted;

}

EXPORT_SYMBOL_GPL(kstrdup_quotable_cmdline);

/*

 * Returns allocated NULL-terminated string containing pathname,

 * with special characters escaped, able to be safely logged. If

 * there is an error, the leading character will be "<".

 */

char *kstrdup_quotable_file(struct file *file, gfp_t gfp)

{

	char *temp, *pathname;

	if (!file)

		return kstrdup("<unknown>", gfp);

	/* We add 11 spaces for ' (deleted)' to be appended */

	temp = kmalloc(PATH_MAX + 11, GFP_TEMPORARY);

	if (!temp)

		return kstrdup("<no_memory>", gfp);

	pathname = file_path(file, temp, PATH_MAX + 11);

	if (IS_ERR(pathname))

		pathname = kstrdup("<too_long>", gfp);

	else

		pathname = kstrdup_quotable(pathname, gfp);

	kfree(temp);

	return pathname;

}

EXPORT_SYMBOL_GPL(kstrdup_quotable_file);